Which one are you trying to DL and where are you from?
These are important things to know if you are going to play Cabal.
Euro client- All IP are blocked except ones originating from Europe.
CABAL Online - The Revolution Of Action
Global Client- Anyone can play except Europe, Japan, and Korea. Those regions IP are blocked. They have their own clients.
CABAL Online - The Revolution of Action
Global client you will have to be a game & game memebr and register for a Single Sign ON account. Then you have to apply for closed beta to get in.
I just checked- Cabalonline.net client is up and running